Shampoo composition comprising gel matrix and histidine

ABSTRACT

A shampoo composition having from about 0.025% to about 0.25% histidine, by weight of the shampoo composition; from about 2% to about 50% of one or more detersive surfactants, by weight of the shampoo composition; and a gel matrix having from about 0.1% to about 20% of one or more fatty alcohols, by weight of the gel matrix; from about 0.1% to about 10% of one or more gel matrix surfactants, by weight of the gel matrix; and from about 20% to about 95% of an aqueous carrier, by weight of the gel matrix.

FIELD OF THE INVENTION

The present invention relates to a shampoo composition that inhibits copper deposition onto hair.

BACKGROUND OF THE INVENTION

Many water sources that are used by consumers for personal care contain elevated levels of calcium and magnesium salts, as well as undesirable levels of redox metals (e.g., copper and/or iron) salts. As such, using chelants to sequester trace redox metals often proves to be ineffective because most chelants also competitively bind calcium and/or magnesium.

It has been found that even trace quantities of these copper can deposit on the hair surface and in between the cuticle layers of hair. This deposition of copper on hair is especially problematic because transition metal ions, such as copper and iron, can facilitate reduction-oxidation (redox) reactions during hair coloring treatments and during UV exposure. These reactions generate reactive oxygen species (ROS), which in turn can cause damage to the hair. In addition, they can interfere with the oxidative color formation chemistry and lead to reduced color uptake for hair colorant users.

Accordingly, there is a need for improved shampoo compositions that can inhibit copper depositing on hair, as well as facilitate the removal of copper already deposited thereon.

SUMMARY OF THE INVENTION

Described herein is a shampoo composition comprising from about 0.025% to about 0.25% histidine, by weight of the shampoo composition; from about 2% to about 50% of one or more detersive surfactants, by weight of the shampoo composition; and a gel matrix comprising from about 0.1% to about 20% of one or more fatty alcohols, by weight of the gel matrix; from about 0.1% to about 10% of one or more gel matrix surfactants, by weight of the gel matrix; and from about 20% to about 95% of an aqueous carrier, by weight of the gel matrix, wherein the shampoo composition inhibits copper deposition on hair and facilitates the removal of copper deposited on hair.

DETAILED DESCRIPTION OF THE INVENTION

While the specification concludes with claims particularly pointing out and distinctly claiming the invention, it is believed that the present invention will be better understood from the following description.

As used herein, the term “fluid” includes liquids and gels.

As used herein, the term “log x” refers to the common (or decadic) logarithm of x.

As used herein, the articles including “a” and “an” when used in a claim, are understood to mean one or more of what is claimed or described.

As used herein, “comprising” means that other steps and other ingredients which do not affect the end result can be added. This term encompasses the terms “consisting of” and “consisting essentially of”.

As used herein, “mixtures” is meant to include a simple combination of materials and any compounds that may result from their combination.

As used herein, “molecular weight” or “M.Wt.” refers to the weight average molecular weight unless otherwise stated.

As used herein, the terms “include,” “includes,” and “including,” are meant to be non-limiting and are understood to mean “comprise,” “comprises,” and “comprising,” respectively.

All percentages, parts and ratios are based upon the total weight of the compositions of the present invention, unless otherwise specified. All such weights as they pertain to listed ingredients are based on the active level and, therefore, do not include carriers or by-products that may be included in commercially available materials.

Unless otherwise noted, all component or composition levels are in reference to the active portion of that component or composition, and are exclusive of impurities, for example, residual solvents or by-products, which may be present in commercially available sources of such components or compositions.

It should be understood that every maximum numerical limitation given throughout this specification includes every lower numerical limitation, as if such lower numerical limitations were expressly written herein. Every minimum numerical limitation given throughout this specification will include every higher numerical limitation, as if such higher numerical limitations were expressly written herein. Every numerical range given throughout this specification will include every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein.

Shampoo Composition

Described herein is a shampoo composition comprising (1) from about 0.025% to about 0.25%, alternatively from about 0.05% to about 0.2% histidine, alternatively from about 0.1% to about 0.15% histidine, by weight of the shampoo composition; (2) from about 2% to about 50% of one or more detersive surfactants, by weight of the shampoo composition; and (3) a gel matrix. The shampoo composition delivers consumer desired shampooing in addition to inhibiting the deposition of copper (i.e. from the water used to rinse) on the hair.

A. Histidine

The shampoo composition comprises from about 0.025% to about 0.25%, alternatively from about 0.05% to about 0.2% histidine, alternatively from about 0.1% to about 0.15% histidine, by weight of the shampoo composition. It has been found that histidine compounds have the high Formation Constant KML for copper and the low Formation Constant for calcium that is desired for efficient inhibition of deposition of copper (see Table 1 below) and can be formulated up to a level of 0.25% in shampoos. Histidine compounds can be either zwitterionic or uncharged. This enables the formulation of a stable shampoo with histidine at a level of from about 0.025% to about 0.25%, alternatively from about 0.05 to about 0.2%, and alternatively from about 0.1 to about 0.15. Histidine is included at levels sufficient to deliver adequate copper removal performance and to reduce copper uptake into hair.

The Formation Constant of a metal chelant interaction is defined as:

$K_{ML} = \frac{\lbrack{ML}\rbrack}{\lbrack M\rbrack \lbrack L\rbrack}$

where:

[ML]=concentration of metal ligand complex at equilibrium

[M]=concentration of free metal ion

[L]=concentration of free ligand in a fully deprotonated form

K_(ML)=formation constant for the metal chelant complex.

All concentrations are expressed in mol/dm³. Formation Constants are conveniently expressed as logarithms

TABLE 1 Log K_(ML) Log K_(ML) Amino Acid Cu Ca Histidine 10.2 1.2 Asparagine 7.8 n/d Tryptophan 8.2 n/d Serine 7.9 1.4 Glutamine 7.7 n/d Alanine 8.1 1.3 Glycine 8.2 1.1 Proline 8.8 n/d EDDS 18.4 4.6

Histidine compounds means compounds according to the general formula (I) below wherein each X is independently selected from substituted or unsubstituted, saturated or unsaturated carbon, preferably unsubstituted and saturated carbon.

n is 0-10, preferably 0-2, more preferably 0 R1 is selected from hydrogen, alkyl, aryl, arylalkyl or alkaryl, preferably hydrogen or alkyl, more preferably hydrogen Y is a heteroatom, preferably nitrogen Q is selected from nil, hydrogen, aryl or alkyl, preferably hydrogen R3 is selected from hydrogen, alkyl, aryl, arylalkyl or alkaryl, preferably hydrogen or alkyl, more preferably hydrogen R4 is independently selected from hydrogen and alkyl, preferably hydrogen

Suitable histidine compounds for use herein include histidine and ester derivatives of histidine. Histidine compounds contain a chiral center and are present in the D- and L-form. For present compositions either form is acceptable as is a mixture of the D- and L-forms.

A person skilled in the art could manufacture histidine compounds using standard techniques. See, for example, Organic Chemistry, Fifth Edition, T W Graham Soloman, John Wiley & Son Inc (1992) 1092-1136.

B. Detersive Surfactant

The shampoo composition may comprise from about 2% to about 50% of one or more detersive surfactants, by weight of the shampoo composition, which provides cleaning performance to the composition. The one or more detersive surfactants in turn may comprise an anionic surfactant, amphoteric or zwitterionic surfactants, or mixtures thereof. Various examples and descriptions of detersive surfactants are set forth in U.S. Pat. No. 6,649,155; U.S. Patent Application Publication No. 2008/0317698; and U.S. Patent Application Publication No. 2008/0206355, which are incorporated herein by reference in their entirety.

The concentration of the one or more detersive surfactants in the shampoo composition should be sufficient to provide the desired cleaning and lather performance, and generally ranges from about 2 wt % to about 50 wt %, from about 5 wt % to about 30 wt %, from about 8 wt % to about 25 wt %, from about 10 wt % to about 20 wt %, about 5 wt %, about 10 wt %, about 12 wt %, about 15 wt %, about 17 wt %, about 18 wt %, or about 20 wt %.

Anionic surfactants suitable for use in the compositions are the alkyl and alkyl ether sulfates. Other suitable anionic surfactants are the water-soluble salts of organic, sulfuric acid reaction products. Still other suitable anionic surfactants are the reaction products of fatty acids esterified with isethionic acid and neutralized with sodium hydroxide. Other similar anionic surfactants are described in U.S. Pat. Nos. 2,486,921; 2,486,922; and 2,396,278, which are incorporated herein by reference in their entirety.

Exemplary anionic surfactants for use in the shampoo composition include ammonium lauryl sulfate, ammonium laureth sulfate, triethylamine lauryl sulfate, triethylamine laureth sulfate, triethanolamine lauryl sulfate, triethanolamine laureth sulfate, monoethanolamine lauryl sulfate, monoethanolamine laureth sulfate, diethanolamine lauryl sulfate, diethanolamine laureth sulfate, lauric monoglyceride sodium sulfate, sodium lauryl sulfate, sodium laureth sulfate, potassium lauryl sulfate, potassium laureth sulfate, sodium lauryl sarcosinate, sodium lauroyl sarcosinate, lauryl sarcosine, cocoyl sarcosine, ammonium cocoyl sulfate, ammonium lauroyl sulfate, sodium cocoyl sulfate, sodium lauroyl sulfate, potassium cocoyl sulfate, potassium lauryl sulfate, triethanolamine lauryl sulfate, triethanolamine lauryl sulfate, monoethanolamine cocoyl sulfate, monoethanolamine lauryl sulfate, sodium tridecyl benzene sulfonate, sodium dodecyl benzene sulfonate, sodium cocoyl isethionate and combinations thereof. In a further embodiment, the anionic surfactant is sodium lauryl sulfate or sodium laureth sulfate.

Suitable amphoteric or zwitterionic surfactants for use in the shampoo composition herein include those which are known for use in shampoo or other personal care cleansing. Concentrations of such amphoteric surfactants range from about 0.5 wt % to about 20 wt %, and from about 1 wt % to about 10 wt %. Non limiting examples of suitable zwitterionic or amphoteric surfactants are described in U.S. Pat. Nos. 5,104,646 and 5,106,609, which are incorporated herein by reference in their entirety.

Amphoteric detersive surfactants suitable for use in the shampoo composition include those surfactants broadly described as derivatives of aliphatic secondary and tertiary amines in which the aliphatic radical can be straight or branched chain and wherein one of the aliphatic substituents contains from about 8 to about 18 carbon atoms and one contains an anionic group such as carboxy, sulfonate, sulfate, phosphate, or phosphonate. Exemplary amphoteric detersive surfactants for use in the present shampoo composition include cocoamphoacetate, cocoamphodiacetate, lauroamphoacetate, lauroamphodiacetate, and mixtures thereof.

Zwitterionic detersive surfactants suitable for use in the shampoo composition include those surfactants broadly described as derivatives of aliphatic quaternaryammonium, phosphonium, and sulfonium compounds, in which the aliphatic radicals can be straight or branched chain, and wherein one of the aliphatic substituents contains from about 8 to about 18 carbon atoms and one contains an anionic group such as carboxy, sulfonate, sulfate, phosphate or phosphonate. In another embodiment, zwitterionics such as betaines are selected.

Non limiting examples of other anionic, zwitterionic, amphoteric or optional additional surfactants suitable for use in the shampoo composition are described in McCutcheon's, Emulsifiers and Detergents, 1989 Annual, published by M. C. Publishing Co., and U.S. Pat. Nos. 3,929,678, 2,658,072; 2,438,091; 2,528,378, which are incorporated herein by reference in their entirety.

C. Gel Matrix

The shampoo composition described herein comprises a gel matrix. The gel matrix comprises (i) from about 0.1% to about 20% of one or more fatty alcohols, alternative from about 0.5% to about 14%, alternatively from about 1% to about 10%, alternatively from about 6% to about 8%, by weight of the gel matrix; (ii) from about 0.1% to about 10% of one or more gel matrix surfactants, by weight of the gel matrix; and (iii) from about 20% to about 95% of an aqueous carrier, alternatively from about 60% to about 85% by weight of the gel matrix.

The fatty alcohols useful herein are those having from about 10 to about 40 carbon atoms, from about 12 to about 22 carbon atoms, from about 16 to about 22 carbon atoms, or about 16 to about 18 carbon atoms. These fatty alcohols can be straight or branched chain alcohols and can be saturated or unsaturated. Nonlimiting examples of fatty alcohols include, cetyl alcohol, stearyl alcohol, behenyl alcohol, and mixtures thereof. Mixtures of cetyl and stearyl alcohol in a ratio of from about 20:80 to about 80:20 are suitable.

The gel matrix surfactants may be any of the detersive surfactants described in section “B” herein.

The aqueous carrier may comprise water, or a miscible mixture of water and organic solvent, and in one aspect may comprise water with minimal or no significant concentrations of organic solvent, except as otherwise incidentally incorporated into the composition as minor ingredients of other components.

The aqueous carrier useful herein includes water and water solutions of lower alkyl alcohols and polyhydric alcohols. The lower alkyl alcohols useful herein are monohydric alcohols having 1 to 6 carbons, in one aspect, ethanol and isopropanol. Exemplary polyhydric alcohols useful herein include propylene glycol, hexylene glycol, glycerin, and propane diol.

D. Shampoo Composition pH

The shampoo compositions described herein may have a pH in the range from about 2 to about 10, at 25° C. In an embodiment, the shampoo composition may have a pH in the range of alternatively from about 5.25 to about 7, alternatively about 6, which may help to solubilize copper and redox metals already deposited on the hair. Thus, the shampoo composition can also be effective toward washing out the existing copper and redox metals deposits, which can reduce cuticle distortion and thereby reduce cuticle chipping and damage. In an embodiment, the shampoo composition may comprise citric acid, wherein the citric acid acts as a buffer.

E. Additional Components

The shampoo composition described herein may optionally comprise one or more additional components known for use in hair care or personal care products, provided that the additional components are physically and chemically compatible with the essential components described herein, or do not otherwise unduly impair product stability, aesthetics or performance Such additional components are most typically those described in reference books such as the CTFA Cosmetic Ingredient Handbook, Second Edition, The Cosmetic, Toiletries, and Fragrance Association, Inc. 1988, 1992. Individual concentrations of such additional components may range from about 0.001 wt % to about 10 wt % by weight of the shampoo composition.

Non-limiting examples of additional components for use in the shampoo compositions include conditioning agents (e.g., silicones, hydrocarbon oils, fatty esters), natural cationic deposition polymers, synthetic cationic deposition polymers, anti-dandruff agents, particles, suspending agents, paraffinic hydrocarbons, propellants, viscosity modifiers, dyes, non-volatile solvents or diluents (water-soluble and water-insoluble), pearlescent aids, foam boosters, additional surfactants or nonionic cosurfactants, pediculocides, pH adjusting agents, perfumes, preservatives, proteins, skin active agents, sunscreens, UV absorbers, and vitamins.

1. Conditioning Agent

The shampoo compositions may comprise one or more conditioning agents. Conditioning agents include materials that are used to give a particular conditioning benefit to hair and/or skin. The conditioning agents useful in the shampoo compositions of the present invention typically comprise a water-insoluble, water-dispersible, non-volatile, liquid that forms emulsified, liquid particles. Suitable conditioning agents for use in the shampoo composition are those conditioning agents characterized generally as silicones (e.g., silicone oils, cationic silicones, silicone gums, high refractive silicones, and silicone resins), organic conditioning oils (e.g., hydrocarbon oils, polyolefins, and fatty esters) or combinations thereof, or those conditioning agents which otherwise form liquid, dispersed particles in the aqueous surfactant matrix.

One or more conditioning agents are present from about 0.01 wt % to about 10 wt %, from about 0.1 wt % to about 8 wt %, and from about 0.2 wt % to about 4 wt %, by weight of the composition.

a. Silicones

The conditioning agent of the shampoo compositions may be an insoluble silicone conditioning agent. The silicone conditioning agent particles may comprise volatile silicone, non-volatile silicone, or combinations thereof. In one embodiment the conditioning agent is a non-volatile silicone conditioning agents. If volatile silicones are present, it will typically be incidental to their use as a solvent or carrier for commercially available forms of non-volatile silicone materials ingredients, such as silicone gums and resins. The silicone conditioning agent particles may comprise a silicone fluid conditioning agent and may also comprise other ingredients, such as a silicone resin to improve silicone fluid deposition efficiency or enhance glossiness of the hair.

The concentration of the silicone conditioning agent typically ranges from about 0.01% to about 10%, by weight of the shampoo compositions, from about 0.1% to about 8%, from about 0.1% to about 5%, and from about 0.2% to about 3%. Non-limiting examples of suitable silicone conditioning agents, and optional suspending agents for the silicone, are described in U.S. Reissue Pat. No. 34,584, U.S. Pat. No. 5,104,646, and U.S. Pat. No. 5,106,609, which descriptions are incorporated herein by reference. The silicone conditioning agents for use in the shampoo compositions may have a viscosity, as measured at 25 Â° C., of from about 20 to about 2,000,000 centistokes (“csk”), from about 1,000 to about 1,800,000 csk, from about 50,000 to about 1,500,000 csk, and from about 100,000 to about 1,500,000 csk.

The dispersed silicone conditioning agent particles typically have a volume average particle diameter ranging from about 0.01 micrometer to about 50 micrometer. For small particle application to hair, the volume average particle diameters typically range from about 0.01 micrometer to about 4 micrometer, from about 0.01 micrometer to about 2 micrometer, from about 0.01 micrometer to about 0.5 micrometer. For larger particle application to hair, the volume average particle diameters typically range from about 5 micrometer to about 125 micrometer, from about 10 micrometer to about 90 micrometer, from about 15 micrometer to about 70 micrometer, from about 20 micrometer to about 50 micrometer.

Background material on silicones including sections discussing silicone fluids, gums, and resins, as well as manufacture of silicones, are found in Encyclopedia of Polymer Science and Engineering, vol. 15, 2d ed., pp 204-308, John Wiley & Sons, Inc. (1989), incorporated herein by reference.

i. Silicone Oils

Silicone fluids include silicone oils, which are flowable silicone materials having a viscosity, as measured at 25° C., less than 1,000,000 csk, from about 5 csk to about 1,000,000 csk, from about 100 csk to about 600,000 csk. Suitable silicone oils for use in the shampoo compositions include polyalkyl siloxanes, polyaryl siloxanes, polyalkylaryl siloxanes, polyether siloxane copolymers, and mixtures thereof. Other insoluble, non-volatile silicone fluids having hair conditioning properties may also be used.

Silicone oils include polyalkyl or polyaryl siloxanes which conform to the following Formula (I):

wherein R is aliphatic, in one embodiment alkyl or alkenyl, or aryl, R can be substituted or unsubstituted, and x is an integer from 1 to about 8,000. Suitable R groups for use in the compositions of the present invention include, but are not limited to: alkoxy, aryloxy, alkaryl, arylalkyl, arylalkenyl, alkamino, and ether-substituted, hydroxyl-substituted, and halogen-substituted aliphatic and aryl groups. Suitable R groups also include cationic amines and quaternary ammonium groups.

Suitable alkyl and alkenyl substituents are C₁ to C₅ alkyls and alkenyls, from C₁ to C₄, alternatively from C₁ to C₂. The aliphatic portions of other alkyl-, alkenyl-, or alkynyl-containing groups (such as alkoxy, alkaryl, and alkamino) can be straight or branched chains, and can be from C₁ to C₅, from C₁ to C₄, from C₁ to C₃, from C₁ to C₂. As discussed above, the R substituents can also contain amino functionalities (e.g. alkamino groups), which can be primary, secondary or tertiary amines or quaternary ammonium. These include mono-, di- and tri-alkylamino and alkoxyamino groups, wherein the aliphatic portion chain length can be as described herein.

ii. Amino and Cationic Silicones

Cationic silicone fluids suitable for use in the shampoo compositions include, but are not limited to, those which conform to the general formula (II):

(R₁)_(a)G_(3-a)-Si—(-—OSiG₂)_(n)-(-—OSiG_(b)(R¹)_(2-b)m)—-O—-SiG_(3-a)(R¹)_(a)

wherein G is hydrogen, phenyl, hydroxy, or C₁-C₈ alkyl, in one embodiment is methyl; a is 0 or an integer having a value from 1 to 3, in one embodiment 0; b is 0 or 1, in one embodiment 1; n is a number from 0 to 1,999, and in one embodiment from 49 to 499; m is an integer from 1 to 2,000, in one embodiment from 1 to 10; the sum of n and m is a number from 1 to 2,000, in one embodiment from 50 to 500; IV is a monovalent radical conforming to the general formula CqH_(2q)L, wherein q is an integer having a value from 2 to 8 and L is selected from the following groups:

-—N(R²)CH₂—-CH₂—-N(R²)₂

-—N(R²)₂

-—N(R²)₃A⁻

-—N(R²)CH₂-—CH₂—NR²H₂A⁻

wherein R² is hydrogen, phenyl, benzyl, or a saturated hydrocarbon radical, in one embodiment an alkyl radical from about C₁ to about C₂₀, and A⁻ is a halide ion.

In one embodiment the cationic silicone corresponding to formula (II) is the polymer known as “trimethylsilylamodimethicone”, which is shown below in formula (III):

Other silicone cationic polymers which may be used in the shampoo compositions described herein are represented by the general formula (IV):

wherein R³ is a monovalent hydrocarbon radical from C₁ to C₁₈, in one embodiment an alkyl or alkenyl radical, such as methyl; R₄ is a hydrocarbon radical, in one embodiment a C₁ to C₁₈ alkylene radical or a C₁₀ to C₁₈ alkyleneoxy radical, in one embodiment a C₁ to C₈ alkyleneoxy radical; Q⁻ is a halide ion, in one embodiment chloride; r is an average statistical value from 2 to 20, in one embodiment from 2 to 8; s is an average statistical value from 20 to 200, in one embodiment from 20 to 50. One suitable example of a polymer in this class is known as UCARE SILICONE ALE 56®, available from Union Carbide.

iii. Silicone Gums

Other silicone fluids suitable for use in the shampoo compositions described herein are the insoluble silicone gums. These gums are polyorganosiloxane materials having a viscosity, as measured at 25° C., of greater than or equal to 1,000,000 csk. Silicone gums are described in U.S. Pat. No. 4,152,416; Noll and Walter, Chemistry and Technology of Silicones, New York: Academic Press (1968); and in General Electric Silicone Rubber Product Data Sheets SE 30, SE 33, SE 54 and SE 76, all of which are incorporated herein by reference. Specific non-limiting examples of silicone gums for use in the compositions of the present invention include polydimethylsiloxane, (polydimethylsiloxane)(methylvinylsiloxane)copolymer, poly(dimethylsiloxane)(diphenyl siloxane)(methylvinylsiloxane)copolymer, and mixtures thereof.

iv. High Refractive Index Silicones

Other non-volatile, insoluble silicone fluid conditioning agents that are suitable for use in the shampoo compositions described herein are those known as “high refractive index silicones,” having a refractive index of at least about 1.46, at least about 1.48, at least about 1.52, or at least about 1.55. The refractive index of the polysiloxane fluid will generally be less than about 1.70, typically less than about 1.60. In this context, polysiloxane “fluid” includes oils as well as gums. The high refractive index polysiloxane fluid includes those represented by general Formula (I) above, as well as cyclic polysiloxanes such as those represented by Formula (V) below:

wherein R is as defined above, and n is a number from about 3 to about 7, or from about 3 to about 5.

The high refractive index polysiloxane fluids contain an amount of aryl-containing R substituents sufficient to increase the refractive index to the desired level, which is described herein. Additionally, R and n must be selected so that the material is non-volatile.

Aryl-containing substituents include those which contain alicyclic and heterocyclic five and six member aryl rings and those which contain fused five or six member rings. The aryl rings themselves can be substituted or unsubstituted.

Generally, the high refractive index polysiloxane fluids may have a degree of aryl-containing substituents of at least about 15%, at least about 20%, at least about 25%, at least about 35%, at least about 50%. Typically, the degree of aryl substitution will be less than about 90%, more generally less than about 85%, and in one embodiment from about 55% to about 80%.

Suitable high refractive index polysiloxane fluids may have a combination of phenyl or phenyl derivative substituents, with alkyl substituents, in one embodiment C₁-C₄ alkyl (in one embodiment methyl), hydroxy, or C₁-C₄ alkylamino (especially —R⁴NHR⁵NH2 wherein each R⁴ and R⁵ independently is a C₁-C₃ alkyl, alkenyl, and/or alkoxy).

When high refractive index silicones are used in the shampoo compositions described herein, they can be used in solution with a spreading agent, such as a silicone resin or a surfactant, to reduce the surface tension by a sufficient amount to enhance spreading and thereby enhance the glossiness (subsequent to drying) of hair treated with the shampoo compositions.

Silicone fluids suitable for use in the shampoo compositions described herein are disclosed in U.S. Pat. No. 2,826,551, U.S. Pat. No. 3,964,500, U.S. Pat. No. 4,364,837, British Pat. No. 849,433, and Silicon Compounds, Petrarch Systems, Inc. (1984), all of which are incorporated herein by reference.

v. Silicone Resins

Silicone resins may be included in the silicone conditioning agent of the shampoo compositions described herein. These resins are highly cross-linked polymeric siloxane systems. The cross-linking is introduced through the incorporation of trifunctional and tetrafunctional silanes with monofunctional or difunctional, or both, silanes during manufacture of the silicone resin.

Silicone materials and silicone resins in particular, can conveniently be identified according to a shorthand nomenclature system known to those of ordinary skill in the art as “MDTQ” nomenclature. Under this system, the silicone is described according to presence of various siloxane monomer units which make up the silicone. Briefly, the symbol M denotes the monofunctional unit (CH₃)₃SiO_(0.5); D denotes the difunctional unit (CH₃)₂SiO; T denotes the trifunctional unit (CH₃)SiO_(1.5); and Q denotes the quadra- or tetra-functional unit SiO₂. Primes of the unit symbols (e.g. M′, D′, T′, and Q′) denote substituents other than methyl, and must be specifically defined for each occurrence.

Suitable silicone resins for use in the shampoo compositions described herein include, but are not limited to MQ, MT, MTQ, MDT and MDTQ resins. Methyl is a suitable silicone substituent. Other suitable silicone resins include MQ resins, wherein the M:Q ratio is from about 0.5:1.0 to about 1.5:1.0 and the average molecular weight of the silicone resin is from about 1000 to about 10,000.

The weight ratio of the non-volatile silicone fluid, having refractive index below 1.46, to the silicone resin component, when used, can be from about 4:1 to about 400:1, from about 9:1 to about 200:1, from about 19:1 to about 100:1, particularly when the silicone fluid component is a polydimethylsiloxane fluid or a mixture of polydimethylsiloxane fluid and polydimethylsiloxane gum as described herein. Insofar as the silicone resin forms a part of the same phase in the compositions hereof as the silicone fluid, i.e. the conditioning active, the sum of the fluid and resin should be included in determining the level of silicone conditioning agent in the shampoo compositions.

b. Organic Conditioning Oils

The conditioning agent of the shampoo compositions described herein may also comprise at least one organic conditioning oil, either alone or in combination with other conditioning agents, such as the silicones described above.

i. Hydrocarbon Oils

Suitable organic conditioning oils for use as conditioning agents in shampoo compositions include, but are not limited to, hydrocarbon oils having at least about 10 carbon atoms, such as cyclic hydrocarbons, straight chain aliphatic hydrocarbons (saturated or unsaturated), and branched chain aliphatic hydrocarbons (saturated or unsaturated), including polymers and mixtures thereof. Straight chain hydrocarbon oils can be from about C₁₂ to about C₁₉. Branched chain hydrocarbon oils, including hydrocarbon polymers, typically will contain more than 19 carbon atoms.

ii. Polyolefins

Organic conditioning oils for use in the shampoo compositions described herein also include liquid polyolefins, including liquid poly-α-olefins and/or hydrogenated liquid poly-α-olefins. Polyolefins for use herein are prepared by polymerization of C₄ to about C₁₄ olefenic monomers, and in one embodiment from about C₆ to about C₁₂.

iii. Fatty Esters

Other suitable organic conditioning oils for use as a conditioning agent in the shampoo compositions described herein include fatty esters having at least 10 carbon atoms. These fatty esters include esters with hydrocarbyl chains derived from fatty acids or alcohols. The hydrocarbyl radicals of the fatty esters hereof may include or have covalently bonded thereto other compatible functionalities, such as amides and alkoxy moieties (e.g., ethoxy or ether linkages, etc.).

iv. Fluorinated Conditioning Compounds

Fluorinated compounds suitable for delivering conditioning to hair or skin as organic conditioning oils include perfluoropolyethers, perfluorinated olefins, fluorine based specialty polymers that may be in a fluid or elastomer form similar to the silicone fluids previously described, and perfluorinated dimethicones.

v. Fatty Alcohols

Other suitable organic conditioning oils for use in the shampoo compositions described herein include, but are not limited to, fatty alcohols having at least about 10 carbon atoms, about 10 to about 22 carbon atoms, and in one embodiment about 12 to about 16 carbon atoms.

vi. Alkyl Glucosides and Alkyl Glucoside Derivatives

Suitable organic conditioning oils for use in the shampoo compositions described herein include, but are not limited to, alkyl glucosides and alkyl glucoside derivatives. Specific non-limiting examples of suitable alkyl glucosides and alkyl glucoside derivatives include Glucam E-10, Glucam E-20, Glucam P-10, and Glucquat 125 commercially available from Amerchol.

c. Other Conditioning Agents

i. Quaternary Ammonium Compounds

Suitable quaternary ammonium compounds for use as conditioning agents in the shampoo compositions described herein include, but are not limited to, hydrophilic quaternary ammonium compounds with a long chain substituent having a carbonyl moiety, like an amide moiety, or a phosphate ester moiety or a similar hydrophilic moiety.

Examples of useful hydrophilic quaternary ammonium compounds include, but are not limited to, compounds designated in the CTFA Cosmetic Dictionary as ricinoleamidopropyl trimonium chloride, ricinoleamido trimonium ethylsulfate, hydroxy stearamidopropyl trimoniummethylsulfate and hydroxy stearamidopropyl trimonium chloride, or combinations thereof.

ii. Polyethylene Glycols

Additional compounds useful herein as conditioning agents include polyethylene glycols and polypropylene glycols having a molecular weight of up to about 2,000,000 such as those with CTFA names PEG-200, PEG-400, PEG-600, PEG-1000, PEG-2M, PEG-7M, PEG-14M, PEG-45M and mixtures thereof.

iii. Cationic Deposition Polymers

The shampoo compositions described herein may further comprise a cationic deposition polymer. Any known natural or synthetic cationic deposition polymer can be used herein. Examples include those polymers disclosed in U.S. Pat. No. 6,649,155; U.S. Patent Application Publication Nos. 2008/0317698; 2008/0206355; and 2006/0099167, which are incorporated herein by reference in their entirety.

The cationic deposition polymer is included in the composition at a level from about 0.01 wt % to about 2 wt %, in one embodiment from about 1.5 wt % to about 1.9 wt %, in another embodiment from about 1.8 wt % to about 2.0 wt %, in view of providing the benefits of the present invention.

The cationic deposition polymer is a water soluble polymer with a charge density from about 0.5 milliequivalents per gram to about 12 milliequivalents per gram. The cationic deposition polymer used in the composition has a molecular weight of about 100,000 Daltons to about 5,000,000 Daltons. The cationic deposition polymer is a low charge density cationic polymer.

In one embodiment, the cationic deposition polymer is a synthetic cationic deposition polymer. A variety of synthetic cationic deposition polymers can be used including mono- and di-alkyl chain cationic surfactants. In one embodiment, mono-alkyl chain cationic surfactants are chosen including, for example, mono-alkyl quaternary ammonium salts and mono-alkyl amines. In another embodiment, di-alkyl chain cationic surfactants are used and include, for example, dialkyl (14-18) dimethyl ammonium chloride, ditallow alkyl dimethyl ammonium chloride, dihydrogenated tallow alkyl dimethyl ammonium chloride, distearyl dimethyl ammonium chloride, dicetyl dimethyl ammonium chloride, and mixtures thereof.

In another embodiment, the cationic deposition polymer is a naturally derived cationic polymer. The term, “naturally derived cationic polymer” as used herein, refers to cationic deposition polymers which are obtained from natural sources. The natural sources may be polysaccharide polymers. Therefore, the naturally derived cationic polymer may be selected from the group comprising starches, guar, cellulose, Cassia, locust bean, Konjac, Tara, galactomannan, tapioca, and synthetic polymers. In a further embodiment, cationic deposition polymers are selected from Mirapol® 100S (Rhodia), Jaguar® C17, polyDADMAC, Tapioca starch (Akzo), Triquat™, and mixtures thereof.

d. Anionic emulsifiers

A variety of anionic emulsifiers can be used in the shampoo compositions described herein. The anionic emulsifiers include, by way of illustrating and not limitation, water-soluble salts of alkyl sulfates, alkyl ether sulfates, alkyl isothionates, alkyl carboxylates, alkyl sulfosuccinates, alkyl succinamates, alkyl sulfate salts such as sodium dodecyl sulfate, alkyl sarcosinates, alkyl derivatives of protein hydrolyzates, acyl aspartates, alkyl or alkyl ether or alkylaryl ether phosphate esters, sodium dodecyl sulphate, phospholipids or lecithin, or soaps, sodium, potassium or ammonium stearate, oleate or palmitate, alkylarylsulfonic acid salts such as sodium dodecylbenzenesulfonate, sodium dialkylsulfosuccinates, dioctyl sulfosuccinate, sodium dilaurylsulfosuccinate, poly(styrene sulfonate) sodium salt, isobutylene-maleic anhydride copolymer, gum arabic, sodium alginate, carboxymethylcellulose, cellulose sulfate and pectin, poly(styrene sulfonate), isobutylene-maleic anhydride copolymer, gum arabic, carrageenan, sodium alginate, pectic acid, tragacanth gum, almond gum and agar; semi-synthetic polymers such as carboxymethyl cellulose, sulfated cellulose, sulfated methylcellulose, carboxymethyl starch, phosphated starch, lignin sulfonic acid; and synthetic polymers such as maleic anhydride copolymers (including hydrolyzates thereof), polyacrylic acid, polymethacrylic acid, acrylic acid butyl acrylate copolymer or crotonic acid homopolymers and copolymers, vinylbenzenesulfonic acid or 2-acrylamido-2-methylpropanesulfonic acid homopolymers and copolymers, and partial amide or partial ester of such polymers and copolymers, carboxymodified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol and phosphoric acid-modified polyvinyl alcohol, phosphated or sulfated tristyrylphenol ethoxylates.

In addition, anionic emulsifiers that have acrylate functionality may also be used in the shampoo compositions described herein. Anionic emulsifiers useful herein include, but aren't limited to: poly(meth)acrylic acid; copolymers of (meth)acrylic acids and its (meth)acrylates with C1-22 alkyl, C1-C8 alkyl, butyl; copolymers of (meth)acrylic acids and (meth)acrylamide; Carboxyvinylpolymer; acrylate copolymers such as Acrylate/C10-30 alkyl acrylate crosspolymer, Acrylic acid/vinyl ester copolymer/Acrylates/Vinyl Isodecanoate crosspolymer, Acrylates/Palmeth-25 Acrylate copolymer, Acrylate/Steareth-20 Itaconate copolymer, and Acrylate/Celeth-20 Itaconate copolymer; Polystyrene sulphonate, copolymers of methacrylic acid and acrylamidomethylpropane sulfonic acid, and copolymers of acrylic acid and acrylamidomethylpropane sulfonic acid; carboxymethycellulose; carboxy guar; copolymers of ethylene and maleic acid; and acrylate silicone polymer. Neutralizing agents may be included to neutralize the anionic emulsifiers herein. Non-limiting examples of such neutralizing agents include sodium hydroxide, potassium hydroxide, ammonium hydroxide, monoethanolamine, diethanolamine, triethanolamine, diisopropanolamine, aminomethylpropanol, tromethamine, tetrahydroxypropyl ethylenediamine, and mixtures thereof. Commercially available anionic emulsifiers include, for example, Carbomer supplied from Noveon under the tradename Carbopol 981 and Carbopol 980; Acrylates/C₁₀-30 Alkyl Acrylate Crosspolymer having tradenames Pemulen TR-1, Pemulen TR-2, Carbopol 1342, Carbopol 1382, and Carbopol ETD 2020, all available from Noveon; sodium carboxymethylcellulose supplied from Hercules as CMC series; and Acrylate copolymer having a tradename Capigel supplied from Seppic. In another embodiment, anionic emulsifiers are carboxymethylcelluloses.

e. Benefit Agents

The benefit agents comprise a material selected from the group consisting of anti-dandruff agents; perfumes; brighteners; enzymes; perfumes; sensates in one aspect a cooling agent; attractants, anti-bacterial agents; dyes; pigments; bleaches; and mixtures thereof.

In one aspect said benefit agent may comprise an anti-dandruff agent. Such anti-dandruff particulate should be physically and chemically compatible with the essential components of the composition, and should not otherwise unduly impair product stability, aesthetics or performance.

According to an embodiment, the shampoo compositions may comprise an anti-dandruff active, which may be an anti-dandruff active particulate. In an embodiment, the anti-dandruff active is selected from the group consisting of: pyridinethione salts; azoles, such as ketoconazole, econazole, and elubiol; selenium sulphide; particulate sulfur; keratolytic agents such as salicylic acid; and mixtures thereof. In an embodiment, the anti-dandruff particulate is a pyridinethione salt.

Pyridinethione particulates are suitable particulate anti-dandruff actives. In an embodiment, the anti-dandruff active is a 1-hydroxy-2-pyridinethione salt and is in particulate form. In an embodiment, the concentration of pyridinethione anti-dandruff particulate ranges from about 0.01 wt % to about 5 wt %, or from about 0.1 wt % to about 3 wt %, or from about 0.1 wt % to about 2 wt %. In an embodiment, the pyridinethione salts are those formed from heavy metals such as zinc, tin, cadmium, magnesium, aluminium and zirconium, generally zinc, typically the zinc salt of 1-hydroxy-2-pyridinethione (known as “zinc pyridinethione” or “ZPT”), commonly 1-hydroxy-2-pyridinethione salts in platelet particle form. In an embodiment, the 1-hydroxy-2-pyridinethione salts in platelet particle form have an average particle size of up to about 20 microns, or up to about 5 microns, or up to about 2.5 microns. Salts formed from other cations, such as sodium, may also be suitable. Pyridinethione anti-dandruff actives are described, for example, in U.S. Pat. No. 2,809,971; U.S. Pat. No. 3,236,733; U.S. Pat. No. 3,753,196; U.S. Pat. No. 3,761,418; U.S. Pat. No. 4,345,080; U.S. Pat. No. 4,323,683; U.S. Pat. No. 4,379,753; and U.S. Pat. No. 4,470,982.

In an embodiment, in addition to the anti-dandruff active selected from polyvalent metal salts of pyrithione, the shampoo compositions may further comprise one or more anti-fungal and/or anti-microbial actives. In an embodiment, the anti-microbial active is selected from the group consisting of: coal tar, sulfur, fcharcoal, whitfield's ointment, castellani's paint, aluminum chloride, gentian violet, octopirox (piroctone olamine), ciclopirox olamine, undecylenic acid and its metal salts, potassium permanganate, selenium sulphide, sodium thiosulfate, propylene glycol, oil of bitter orange, urea preparations, griseofulvin, 8-hydroxyquinoline ciloquinol, thiobendazole, thiocarbamates, haloprogin, polyenes, hydroxypyridone, morpholine, benzylamine, allylamines (such as terbinafine), tea tree oil, clove leaf oil, coriander, palmarosa, berberine, thyme red, cinnamon oil, cinnamic aldehyde, citronellic acid, hinokitol, ichthyol pale, Sensiva SC-50, Elestab HP-100, azelaic acid, lyticase, iodopropynyl butylcarbamate (IPBC), isothiazalinones such as octyl isothiazalinone, and azoles, and mixtures thereof. In an embodiment, the anti-microbial is selected from the group consisting of: itraconazole, ketoconazole, selenium sulphide, coal tar, and mixtures thereof.

In an embodiment, the azole anti-microbials is an imidazole selected from the group consisting of: benzimidazole, benzothiazole, bifonazole, butaconazole nitrate, climbazole, clotrimazole, croconazole, eberconazole, econazole, elubiol, fenticonazole, fluconazole, flutimazole, isoconazole, ketoconazole, lanoconazole, metronidazole, miconazole, neticonazole, omoconazole, oxiconazole nitrate, sertaconazole, sulconazole nitrate, tioconazole, thiazole, and mixtures thereof, or the azole anti-microbials is a triazole selected from the group consisting of: terconazole, itraconazole, and mixtures thereof. When present in the shampoo composition, the azole anti-microbial active is included in an amount of from about 0.01 wt % to about 5 wt %, or from about 0.1 wt % to about 3 wt %, or from about 0.3 wt % to about 2 wt %. In an embodiment, the azole anti-microbial active is ketoconazole. In an embodiment, the sole anti-microbial active is ketoconazole.

The shampoo compositions described herein may also comprise a combination of anti-microbial actives. In an embodiment, the combination of anti-microbial active is selected from the group of combinations consisting of: octopirox and zinc pyrithione, pine tar and sulfur, salicylic acid and zinc pyrithione, salicylic acid and elubiol, zinc pyrithione and elubiol, zinc pyrithione and climbasole, octopirox and climbasole, salicylic acid and octopirox, and mixtures thereof.

In an embodiment, the shampoo compositions may comprise an effective amount of a zinc-containing layered material. In an embodiment, the composition comprises from about 0.001 wt % to about 10 wt %, or from about 0.01 wt % to about 7 wt %, or from about 0.1 wt % to about 5 wt % of a zinc-containing layered material, by total weight of the shampoo composition.

Zinc-containing layered materials may be those with crystal growth primarily occurring in two dimensions. It is conventional to describe layer structures as not only those in which all the atoms are incorporated in well-defined layers, but also those in which there are ions or molecules between the layers, called gallery ions (A. F. Wells “Structural Inorganic Chemistry” Clarendon Press, 1975). Zinc-containing layered materials (ZLMs) may have zinc incorporated in the layers and/or be components of the gallery ions. The following classes of ZLMs represent relatively common examples of the general category and are not intended to be limiting as to the broader scope of materials which fit this definition.

Many ZLMs occur naturally as copper. In an embodiment, the ZLM is selected from the group consisting of: hydrozincite (zinc carbonate hydroxide), aurichalcite (zinc copper carbonate hydroxide), rosasite (copper zinc carbonate hydroxide), and mixtures thereof. Related copper that are zinc-containing may also be included in the composition. Natural ZLMs can also occur wherein anionic layer species such as clay-type copper (e.g., phyllosilicates) contain ion-exchanged zinc gallery ions. All of these natural materials can also be obtained synthetically or formed in situ in a composition or during a production process.

Another common class of ZLMs, which are often, but not always, synthetic, is layered double hydroxides. In an embodiment, the ZLM is a layered double hydroxide conforming to the formula [M²⁺ _(1−x)M³⁺ _(x)(OH)₂]^(x+)A^(m−) _(x/m).nH₂O wherein some or all of the divalent ions (M²⁺) are zinc ions (Crepaldi, E L, Pava, P C, Tronto, J, Valim, J B J. Colloid Interfac. Sci. 2002, 248, 429-42).

Yet another class of ZLMs can be prepared called hydroxy double salts (Morioka, H., Tagaya, H., Karasu, M, Kadokawa, J, Chiba, K Inorg. Chem. 1999, 38, 4211-6). In an embodiment, the ZLM is a hydroxy double salt conforming to the formula [M²⁺ _(1−x)M²⁺ _(1+x)(OH)_(3(1-y))]⁺A^(n−) _((1=3y)/n).nH₂O where the two metal ions (M²⁺) may be the same or different. If they are the same and represented by zinc, the formula simplifies to [Zn_(1+x)(OH)₂]^(2x+)2x A⁻.nH₂O. This latter formula represents (where x=0.4) materials such as zinc hydroxychloride and zinc hydroxynitrate. In an embodiment, the ZLM is zinc hydroxychloride and/or zinc hydroxynitrate. These are related to hydrozincite as well wherein a divalent anion replaces the monovalent anion. These materials can also be formed in situ in a composition or in or during a production process.

In embodiments having a zinc-containing layered material and a pyrithione or polyvalent metal salt of pyrithione, the ratio of zinc-containing layered material to pyrithione or a polyvalent metal salt of pyrithione may be from about 5:100 to about 10:1, or from about 2:10 to about 5:1, or from about 1:2 to about 3:1.

The on-scalp deposition of the anti-dandruff active may be at least about 1 microgram/cm². The on-scalp deposition of the anti-dandruff active is important in view of ensuring that the anti-dandruff active reaches the scalp where it is able to perform its function. In an embodiment, the deposition of the anti-dandruff active on the scalp is at least about 1.5 microgram/cm², or at least about 2.5 microgram/cm², or at least about 3 microgram/cm², or at least about 4 microgram/cm², or at least about 6 microgram/cm², or at least about 7 microgram/cm², or at least about 8 microgram/cm², or at least about 8 microgram/cm², or at least about 10 microgram/cm². The on-scalp deposition of the anti-dandruff active is measured by having the hair of individuals washed with a composition comprising an anti-dandruff active, for example a composition pursuant to the present invention, by trained a cosmetician according to a conventional washing protocol. The hair is then parted on an area of the scalp to allow an open-ended glass cylinder to be held on the surface while an aliquot of an extraction solution is added and agitated prior to recovery and analytical determination of anti-dandruff active content by conventional methodology, such as HPLC.

The shampoo compositions of the present invention may be presented in typical shampoo formulations. They may be in the form of solutions, dispersion, emulsions, powders, talcs, encapsulated, spheres, spongers, solid dosage forms, foams, and other delivery mechanisms. The compositions of the embodiments of the present invention may be hair tonics, leave-on hair products such as treatment, and styling products, rinse-off hair products such as shampoos, and treatment products; and any other form that may be applied to hair.

According to one embodiment, the shampoo compositions may be provided in the form of a porous, dissolvable solid structure, such as those disclosed in U.S. Patent Application Publication Nos. 2009/0232873; and 2010/0179083, which are incorporated herein by reference in their entirety. Accordingly, the shampoo compositions comprise a chelant, a buffer system comprising an organic acid, from about 23% to about 75% surfactant; from about 10% to about 50% water soluble polymer; and optionally, from about 1% to about 15% plasticizer; such that the shampoo composition is in the form of a flexible porous dissolvable solid structure, wherein said structure has a Percent open cell content of from about 80% to about 100%.

According to another embodiment, the shampoo compositions may be in the form of a porous dissolvable solid structure comprising a chelant; a buffer system comprising an organic acid from about 23% to about 75% surfactant; wherein said surfactant has an average ethoxylate/alkyl ratio of from about 0.001 to about 0.45; from about 10% to about 50% water soluble polymer; and from about 1% to about 15% plasticizer; and wherein said article has a density of from about 0.03 g/cm³ to about 0.20 g/cm³.

According to another embodiment, the shampoo compositions may be in the form of a viscous liquid comprising a chelant; a buffer system comprising an organic acid from 5-20% surfactant and a polycarboxylate rheology modifier; wherein the polycarboxylate is specifically chosen to be effective at the high electrolyte levels resulting from the incorporation of the key buffer system and chelant required for this invention. Non-limiting examples include acrylates/C10-C30 alkyl acrylate crosspolymers such as Carbopol EDT2020, 1342,1382, etc. from Lubrizol. Rheology benefits of these actives in our embodiments include stability, ease of dispensing, smoothness of spreading, etc.

The shampoo compositions are generally prepared by conventional methods such as are known in the art of making the compositions. Such methods typically involve mixing of the ingredients in one or more steps to a relatively uniform state, with or without heating, cooling, application of vacuum, and the like. The compositions are prepared such as to optimize stability (physical stability, chemical stability, photostability) and/or delivery of the active materials. The shampoo composition may be in a single phase or a single product, or the shampoo composition may be in a separate phases or separate products. If two products are used, the products may be used together, at the same time or sequentially. Sequential use may occur in a short period of time, such as immediately after the use of one product, or it may occur over a period of hours or days.

Test Methods

It is understood that the test methods that are disclosed in the Test Methods Section of the present application should be used to determine the respective values of the parameters of Applicants' invention as such invention is described and claimed herein.

A. Viscosity Measurements

A Brookfield viscometer is equipped with a CPE-41 cone and cup assembly. Water bath of cup are set to 30° C. Gap is set according to the manufacturer's instruction manual. 2.0 mL of sample is placed in the center of the cup and a shear rate of 0.3 RPM is set. Viscosity measurement was taken after 210 seconds.

Examples

The following examples illustrate the present invention. The exemplified compositions can be prepared by conventional formulation and mixing techniques. It will be appreciated that other modifications of the present invention within the skill of those in the shampoo formulation art can be undertaken without departing from the spirit and scope of this invention. All parts, percentages, and ratios herein are by weight unless otherwise specified. Some components may come from suppliers as dilute solutions. The amount stated reflects the weight percent of the active material, unless otherwise specified.

The following are non-limiting examples of shampoo compositions either encompassed by embodiments of the present invention or comparative.

Ingredient 1 (Comparative) 2 Sodium Laureth Sulfate (SLE3S) 6 10 Sodium Lauryl Sulfate (SLS) 6 1.5 Sodium Laureth Sulfate (SLE1S) — — Cocamidopropyl betaine (CapB) 1 — Coconut monoethanol amide (CMEA) 0.85 — Gel Matrix (C16OH/C18OH) — 2 Dimethicone 1 1 Ethylene glycol distearate (EGDS) 1.5 1.5 Jaguar ® C500¹ 0.25 0.15 Citric acid 0.10 0.10 Histidine 0.10 0.50 pH 4.5 4.5 Water-USP Purified & Minors Q.S. to 100 Q.S. to 100 ¹Cationic polymer derived from a natural gum with low aqueous viscosity

Ingredient 3 4 5 6 Water-USP Purified & Minors Q.S. to 100 Q.S. to 100 Q.S. to 100 Q.S. to 100 Sodium Laureth Sulfate 12 14 12 14 (SLE1S) Sodium Lauryl Sulfate (SLS) 1.5 — 1.5 — Cocoamidoproply Betaine 1.7 1.7 1.7 1.7 (CapB) Gel Matrix 1.0 1.0 2.0 2.0 Guar Hydroxypropyltrimonium 0.3 0.3 0.3 0.3 Chloride Polyquaternium 6 (DADMAC) — — — — 0.1 0.1 0.1 0.1 Ethylene Glycol Distearate 1.5 — 1.5 Trihydroxy Stearin (Thixcin) — 0.1 — 0.1 Dimethicone/Dimethiconol 1.0 1.0 0.5 0.5 Citric Acid 1.0 1.0 1.0 1.0 Sodium Citrate Dihydrate 1.0 1.0 1.0 1.0 Acrylates/C10-C30 alkyl Acrylate Crosspolymers — 0.3 — — Histidine 0.05 0.1 0.05 0.1 Kathon 0.0005 0.0005 0.0005 0.0005 Sodium Benzoate 0.25 0.25 0.25 0.25 Disodium EDTA 0.1274 0.1274 0.1274 0.1274 Perfume 0.8 0.8 0.8 0.8 Sodium Chloride¹ 0-3 0-3 0-3 0-3 Sodium Xylene Sulfonate¹ 0-3 0-3 0-3 0-3 ¹Levels adjusted to reach desired viscosity

Gel Matrix Method of Preparation

The gel matrix may be formed by combining fatty alcohols and surfactants in the ratio of 1:1 to 40:1, alternatively from 2:1 to 20:1, and alternatively from 3:1 to 10:1. The formation of a gel matrix involves heating a dispersion of the fatty alcohol in water with the surfactant to a temperature above the melting point of the fatty alcohol. During the mixing process, the fatty alcohol melts, allowing the surfactant to partition into the fatty alcohol droplets. The surfactant brings water along with it into the fatty alcohol. This changes the isotropic fatty alcohol drops into liquid crystalline phase drops. When the mixture is cooled below the chain melt temperature, the liquid crystal phase is converted into a solid crystalline gel matrix.

Example Gel Matrix Composition

Ingredient Wt. % Water qs Cetyl Alcohol 4% Steary Alcohol 8% Sodium laureth-1 sulfate (28% Active) 11%

Data

Now referring to Tables 2 and 3, it was surprisingly found that histidine delivered better performance in a gel matrix shampoo than in a simple surfactant shampoo when used to remove copper from the hair and to inhibit copper deposition onto the hair. The performance difference was statistically different. The formulas for each leg in Tables 2 and 3 can be found in Table 4.

TABLE 2 Cu content after Leg 20 wash cycles (1) Simple Surfactant SH pH 6 91.5 A (3) Simple Surfactant SH + 0.1% 46.8 B Histidine pH 6 (4) Gel Matrix SH + 0.1% Histidine 41.8 C pH 6 *Levels not connected by same letter are statistically different.

TABLE 3 Cu content after Leg 20 wash cycles (1) Simple Surfactant SH pH 6 88.1 A (2) Gel Matrix SH pH 6 67.1 B (3) Simple Surfactant SH + 0.1% 43.5 C Histidine pH 6 (4) Gel Matrix SH + 0.1% 37.0 D Histidine pH 6 *Levels not connected by same letter are statistically different.

TABLE 4 Ingredient (1) (2) (3) (4) Sodium Laureth Sulfate (SLE3S) — — 10 10 Sodium Lauryl Sulfate (SLS) 1.5 1.5 1.5 1.5 Sodium Laureth Sulfate (SLE1S) 10.5 10.5 — — Cocamidopropyl betaine (CapB) 1.0 1.0 — — Coconut monoethanol amide (CMEA) — — — — Gel Matrix (C16OH/C18OH) — — 2 2 Dimethicone — — 1 1 Ethylene glycol distearate (EGDS) — — 1.5 1.5 Jaguar ® C500 — — 0.15 0.15 Citric acid 1.0 1.0 0.10 0.10 Methylchloroisothiazolinone with 0.03 0.03 — — methylisothiazolinone Histidine — 0.10 — 0.10 Sodium chloride 1.0 1.0 — pH 6.0 6.0 6.0 6.0 Water-USP Purified & Minors — Q.S. to 100 Q.S. to 100 Q.S. to 100

Data Test Method

Hair switches had been colored once with an oxidative hair colorant. An extra blonde shade was used for the testing. The hair switches were washed for 20 repeat wash cycles in tap water containing 7 grains per gallon water hardness (Ca/Mg) and 0.06 μg/g copper ions. Each wash cycle consisted of two applications of 0.1 g/g a shampoo to the hair switches. Each application consisted of adding shampoo to the hair, milking for 30 secs followed by rinsing for 30 secs. Shampoo was then reapplied 0.1 g/g, milked for 30 secs, rinsed for 30 secs and then dried in a heat box (60° C.) until dry.

Samples of 100 mg of hair were digested overnight with 2 ml of high purity concentrated nitric acid. The digestive mixture also contained 150 μL of 100 μg/g Yttrium internal standard (Inorganic Ventures, Christianburg, Va., USA). Following digestion, samples were heated to 70-80° C. for one hour, cooled to room temperature and diluted to 15 mL with deionized water. Copper content of the hair switches was determined by inductively coupled plasma atomic spectroscopy (ICP-OES)). For each leg, 3 different samples were analyzed.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”.

Every document cited herein, including any cross referenced or related patent or application, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests, or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.

While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention. 

What is claimed is: 1) A shampoo composition comprising: a. from about 0.025% to about 0.25% histidine, by weight of the shampoo composition; b. from about 2% to about 50% of one or more detersive surfactants, by weight of the shampoo composition; and c. a gel matrix comprising: i. from about 0.1% to about 20% of one or more fatty alcohols, by weight of the gel matrix; ii. from about 0.1% to about 10% of one or more gel matrix surfactants, by weight of the gel matrix; and iii. from about 20% to about 95% of an aqueous carrier, by weight of the gel matrix; wherein the shampoo composition inhibits copper deposition on hair and facilitates the removal of copper deposited on hair. 2) The shampoo composition of claim 1, wherein the shampoo composition comprises from about 0.05% to about 0.2% histidine, by weight of the shampoo composition. 3) The shampoo composition of claim 1, wherein the shampoo composition comprises from about 0.1% to about 0.15% histidine, by weight of the shampoo composition. 4) The shampoo composition of claim 1, wherein the aqueous carrier is water. 5) The shampoo composition of claim 1, wherein the shampoo composition further comprises one or more additional benefit agents. 6) The shampoo composition of claim 5, wherein the one or more additional benefit agents is selected from the group consisting of anti-dandruff agents, vitamins, chelants, perfumes, brighteners, enzymes, sensates, attractants, anti-bacterial agents, dyes, pigments, bleaches, and mixtures thereof. 7) The shampoo composition of claim 5, wherein the one or more additional benefit agents is an anti-dandruff agent. 8) The shampoo composition of claim 1, wherein the shampoo composition further comprises citric acid. 9) The shampoo composition of claim 1, wherein the shampoo composition has a pH of from about 5.25 to about
 7. 10) A method of inhibiting copper deposition on hair and facilitating the removal of copper deposited on hair comprising: a. applying to the hair the shampoo composition of claim 1; and b. rinsing the shampoo composition from the hair. 